JVC VN-V685U - Manual (Page 6)

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boundary structure shows file size of each JPEG file. Using the size, reading the whole JPEG data becomes easy.
When ptz_info=on is specified, boundary, pan/tilt/zoom information and JPEG file will be sent out continuously after
HTTP Response as follows.
Example of Booundary and pan/tilt/zoom information:
--foo
Content-Type: image/jpeg
Content-Length: 31200
X-Puls-Pan: 0
X-Puls-Tilt: 0
X-Posi-Zoom: 0
HTTP Response
JPEG (No. 1)
JPEG (No. 2)
,,,
HTTP Response
JPEG (No. 1)
JPEG (No. 2)
,,,
boundary
pan/tilt/zoom information
pan/tilt/zoom information
boundary
JPEG (No. 1)
-foo
Content-Type: image/jpeg
Content-Length: 31614
-foo
Content-Type: image/jpeg
Content-Length: 32756